Improvement in plows



R. B; THOMSON.

' PLOW. No. 189,151. Q Patented April 3, .1877.

WITNESSES N. PETERS, PHOTO-LITHOGRAPIIER, WASHINGTON D C.

.f ATE S PATENT Qrrion.

ROBERT B. THOMSON, OF DANSVILLE, MICHIGAN.

IMPROVEMENT IN PLOWS.

Specification forming part of Letters Patent No. 189,151, dated April 3,1877; application filed February 10, 1877.

To all whom it may concern:

Be it known that I, ROBERT BEN. THOMSON, of Dansville, in the county ofIngham and State of Michigan, have invented a new and useful Improvementin Plows, of which the following is a specification Figure l is a sideview of my improved plow. Fig. 2 is a top view of, the same. Fig. 3 is adetail section of the plow and plow-beam through the line at w, and ofthe colter and cOlter-holder through the line w m, Fig. 1.

Similar letters of reference indicate corresponding parts.

The invention will first be described in connection with the drawing,and then pointed out in the claim.

A is the mold-board, B is the point,O is landside, D is the forwardstandard, E is the rear standard, and F is the beam, of the plow. Thestandards D E are made with bends or offsets near their upper ends, tobring the beam F directly over the line of resistance. The upper end ofthe forward standard D has a forward projection or arm, Gr, formed uponit, through which passes the bolt H, that secures and pivots the beam Fto the said standard D. Upon the upper end of-the rear standard E isformed a projection or plate, I, which is made in the form of a sectionof a circle. The forward edge of the plate I is concaved, and has aflange formed upon its lower side to receive the hook oi the hook-boltJ, which passes up through the rear end of the beam F, so that byloosening the nut of the bolt J the rear end of the plow-beam F maybemoved from or toward the unplowed' land, to adjust the plow to take orleave land, as may be desired. K is the colter, the lower part or bladeof which is straight, and is set at an inclination corrugations upon theunder side of the said arm G. The lower arm of the colter-holder L isslotted longitudinally to receive the bolt H, by which it is secured inplace. The upper arm of the colter-holder L is slotted longitudinally toreceive the bolt M, by which the colter K is secured to it. Severalholes are formed in the stem of the colter K to receive the bolt M. Bythis construction the colter K is entirely independent of the beam F,and

may be adjusted up or down and toward or from the land, as may bedesired.

N are the handles, which are connected by rounds O, the lower ends ofwhich are secured to the land-side G and mold-board A by bolts, theupper bolts passing through slots, so that the rear ends of the handlesN may raised and lowered to correspond with the height of the plowman.

Having thus described my invention, I

claim as new and desire to secure by Letters I Pateut The angularadjustable colter-holder L, in combination with the arm G of thestandard D and with the colter K, substantially as herein shown anddescribed.

ROBERT BEN. THOMSON. Witnesses:

JAMES THOMsoN,

MARCUS M. ATWOOD.

